class_docstr: RCNN head with two Fully Connected layers
  
  Args:
      mlp_dim (int): num of filters for the fc layers
code: def __init__(self, mlp_dim=1024):
      super(TwoFCHead, self).__init__()
      self.mlp_dim = mlp_dim
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from collections import OrderedDict
  from paddle import fluid
  from paddle.fluid.param_attr import ParamAttr
  from paddle.fluid.initializer import Normal, Xavier
  from paddle.fluid.regularizer import L2Decay
  from paddle.fluid.initializer import MSRA
label_desc: Use image node_id 1 to create a new TwoFCHead object from inherited base classes: object with example: obj = TwoFCHead(mlp_dim)